There is a USB 3.0 front panel header between the SATA ports and the 24 pin ATX power connection.

LLC is not really used with the Haswell Architecture. You have adaptive vcore, offset mode and a static mode that works best when overclocked to ensure you do not get a vcore overshoot that will kill you on the thermals. Working on another board right now and I am still at 4.7Ghz with 1.35v static.